{"answers":{"affected":"5 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21696 in the wild and no public exploit code.","fix":"Upgrade org.jenkins-ci.main:jenkins-core to a fixed version for your release line: 2.303.3 or 2.319.","what":"CVE-2021-21696 is a critical vulnerability in Jenkins Jenkins, published on 4 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-21696 and fix it if it is affected.\n\nWhat it is: CVE-2021-21696 is a critical vulnerability in Jenkins Jenkins, published on 4 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-21696 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.jenkins-ci.main:jenkins-core (Maven): affected all versions; fixed in 2.303.3\n- org.jenkins-ci.main:jenkins-core (Maven): affected all versions; fixed in 2.303.3\n- org.jenkins-ci.main:jenkins-core (Maven): affected from 2.304; fixed in 2.319\n- org.jenkins-ci.main:jenkins-core (Maven): affected from 2.304; fixed in 2.319\n- jenkins (Bitnami): affected all versions; fixed in 2.318.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-21696/ (Markdown: https://insights.sbomify.com/CVE-2021-21696/index.md)","id":"CVE-2021-21696","markdown":"https://insights.sbomify.com/CVE-2021-21696/index.md","name":"CVE-2021-21696","record":{"aliases":["BIT-jenkins-2021-21696","GHSA-c5r9-rx53-q3gf"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Jenkins automation server","requires_auth":"none","summary":"Attackers controlling agent processes can replace trusted library code to execute unsandboxed code on the Jenkins controller.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jenkins","cpe":[{"product":"jenkins","vendor":"jenkins"}],"cvss":{"score":9.8,"severity":"critical","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not limit agent read/write access to the libs/ directory inside build directories when using the FilePath APIs, allowing attackers in control of agent processes to replace the code of a trusted library with a modified variant. This results in unsandboxed code execution in the Jenkins controller process.","ecosystems":["Bitnami","Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Agent-to-controller access control allowed writing to sensitive directory used by Jenkins Pipeline: Shared Groovy Libraries Plugin","id":"CVE-2021-21696","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"jenkins:jenkins","products":["jenkins:jenkins"],"type":"privilege_escalation","year":"2021"},"n_packages":5,"n_references":2,"next":{"headline":"Agent-to-controller access control allows reading/writing most content of build directories in Jenkins","id":"CVE-2021-21697"},"packages":[{"ecosystem":"Bitnami","fixed":["2.318.1"],"introduced":["0"],"last_affected":[],"package":"jenkins","purl":"pkg:bitnami/jenkins","source":"BIT-jenkins-2021-21696"},{"ecosystem":"Maven","fixed":["2.303.3"],"introduced":["0"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":null,"source":"GHSA-c5r9-rx53-q3gf"},{"ecosystem":"Maven","fixed":["2.303.3"],"introduced":["0"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","source":"GHSA-c5r9-rx53-q3gf"},{"ecosystem":"Maven","fixed":["2.319"],"introduced":["2.304"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":null,"source":"GHSA-c5r9-rx53-q3gf"},{"ecosystem":"Maven","fixed":["2.319"],"introduced":["2.304"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","source":"GHSA-c5r9-rx53-q3gf"}],"prev":{"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21695"},"products":["Jenkins"],"published":"2021-11-04","related":[{"cvss_score":9.8,"headline":"Jenkins Command Line Interface (CLI) Path Traversal","id":"CVE-2024-23897","kev_date_added":"2024-08-19","published":"2024-01-24"},{"cvss_score":9.8,"headline":"Jenkins Stapler Web Framework Deserialization of Untrusted Data","id":"CVE-2018-1000861","kev_date_added":"2022-02-10","published":"2018-12-10"},{"cvss_score":9.8,"headline":"Jenkins Remote Code Execution","id":"CVE-2017-1000353","kev_date_added":"2025-10-02","published":"2018-01-29"},{"cvss_score":7.5,"headline":"Jenkins User Interface (UI) Information Disclosure","id":"CVE-2015-5317","kev_date_added":"2023-05-12","published":"2015-11-25"},{"cvss_score":9.8,"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21690","kev_date_added":null,"published":"2021-11-04"},{"cvss_score":9.8,"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21691","kev_date_added":null,"published":"2021-11-04"},{"cvss_score":9.8,"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21692","kev_date_added":null,"published":"2021-11-04"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["Jenkins project"]},"summary":"Attackers controlling agent processes can replace trusted library code to execute unsandboxed code on the Jenkins controller.","url":"https://insights.sbomify.com/CVE-2021-21696/"}